living organisms see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Superkingdom Eukaryotae see Domain Eukaryota Chatton, 1925
     Kingdom Animalia Linnaeus, 1758 - animals
       Subkingdom Eumetazoa Butschli, 1910 see [unranked] Eumetazoa Bütschli, 1910
         Phylum Annelida Lamarck, 1809 - segmented worms
           Class Polychaeta Grube, 1850 - polychaetes
             Order Spionida Rouse & Fauchald, 1997
               Family Spionidae Grube, 1850
                 1 Genus Scolelepis Blainville, 1828
                 2 Genus Paraprionospio Caullery, 1914
                 3 Genus Polydora Bosc, 1802
                 4 Genus Spiophanes Grube, 1860
                 5 Genus Streblospio Webster, 1879
                 6 Genus Prionospio Malmgren, 1867
                 7 Genus Spio Fabricius, 1785
                 8 Genus Pygospio Claparède, 1863